Armstrong A+ System FuselageArmstrong A+ System Fuselage The new TC A+ System Fuselage connection is taking compatibility, strength, and durability into the futureRunning through the heart of each fuselage is a solid Titanium Core, our new A+ System takes advantage of this by incorporating full width Titanium Barrel Nuts across both mast and front wing connections to lock them in position. The unique HEX fitting for the mast and front wing gives 360 degree surface contact,